Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba90d90cd75c1241…

MALICIOUS

PDF

95.5 KB Created: 2021-05-07 03:44:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 40de87e37715fc9835452f35663ce1ea SHA-1: 2df2363aff2b25c0e54e77c231e48b8eca0e8c85 SHA-256: ba90d90cd75c1241fc1fd080e7cc6c43d8d24bd1f95b3ca5cc95ee88140ba732
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous external links, many pointing to disposable hosting, and one suspicious URL that appears to be a redirector for a phishing or malware campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The document body, though heavily obfuscated, contains text related to a 'Casio protrek prw 2500 instruction manual', suggesting a lure to trick users into clicking the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://mezovuduw.ru/strik?utm_term=casio+protrek+prw+2500+instruction+manual PDF link annotation
    • https://cdn.sqhk.co/nozedimasav/ZdgdJlW/happy_birthday_cake_with_name_and_photo_edit.pdfIn PDF document text
    • http://vofufime.mypressonline.com/region_departement_et_arrondissement_du_cameroun.pdfIn PDF document text
    • http://tuduvodakep.mypressonline.com/61109986592.pdfIn PDF document text
    • http://casser.xyz/what_does_an_environmental_impact_assessment_includetxdxg.pdfIn PDF document text
    • http://carishr.com/545098603430vbml.pdfIn PDF document text
    • http://kdghy.online/omb_circular_a-11_appendix_ct94hp.pdfIn PDF document text
    • https://cdn.sqhk.co/fekoguwiwu/jfighc6/86156685861.pdfIn PDF document text
    • https://cdn.sqhk.co/gobisofokox/cibUz9H/quiz_flags_of_the_world_printable.pdfIn PDF document text
    • https://cdn.sqhk.co/sabumijobude/hlialHH/maludogovatefetaxakem.pdfIn PDF document text
    • http://xofelivigavas.mywebcommunity.org/skin_cancer_information.pdfIn PDF document text
    • http://nakekizedexu.getenjoyment.net/julius_caesar_sparknotes_act_2_scene_1.pdfIn PDF document text
    • http://f13x.xyz/cloud9_csgo_salaryfprbs.pdfIn PDF document text
    • http://siditomema.22web.org/wekirekoferemuxuto.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://c3438639-6a75-4920-aa4f-d1e0b619354f.filesusr.com/ugd/3be3a7_d20564a9947443ecb8f3b6946c9a015b.pdf?index=trueIn PDF document text
    • https://8271b8e8-1520-4b18-8785-2fafc8cd33e6.filesusr.com/ugd/efc97f_f6f473942d7d43bdaea3397e0e7b5efd.pdf?index=trueIn PDF document text
    • http://movalezipukud.epizy.com/bujolobogisivumuvarafal.pdfIn PDF document text
    • https://dd67658a-cc17-4e1c-bca5-42bf299a485b.filesusr.com/ugd/07a440_621c109ca65d4864b19e98870e3e20cb.pdf?index=trueIn PDF document text
    • https://f1e11ea9-a931-46ad-af30-391325c877dd.filesusr.com/ugd/423518_3329e27078f94e97ae12d8ae0341a3ba.pdf?index=trueIn PDF document text
    • https://a519209a-2b0a-481f-9fe9-460c873bdc80.filesusr.com/ugd/270e53_008c9417a97444d5a938e8771e39e3f7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/fdb7ce91-b521-4f43-8f43-d5ba7fd06029/54886385498.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59be7259-96d8-4a15-8289-c37babf29bac/what_is_a_gram_positive_cocci.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb0e1d85-39ae-44dd-a400-fdd27caaf999/best_on_acorn_tv_october_2020.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000126ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126FF 5536 bytes
SHA-256: 7e0ec3ec0925cdf4fa48c4a5edb48dbbc6dc8dfbef573b89af37815cb9fdc4c5
font_01_sfnt_off000139dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139DD 11276 bytes
SHA-256: 1c0a36495633e27683bb435302ef5309d0cb488ff55e40001b2da3939392d9ab
font_02_sfnt_off0001608d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1608D 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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